Shulou(Shulou.com)06/02 Report--

This article introduces the relevant knowledge of "what are the basic grammars of Scala". In the operation of actual cases, many people will encounter such a dilemma. Then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Hello, HelloScala.

Object FunctionApp {def main (args: Array [String]): Unit = {println ("HelloScala.")}}

two。 Basic definition of function / method

Object FunctionApp {def main (args: Array [String]): Unit = {/ / call function println (add (10helm 5)) sayhello () sayhello / / can also be called without parentheses In special cases, you must enter the parameter def add (x:Int) with parentheses / /. Y:Int): Int = {x * y} def sayhello (): Unit = {println ("I don't have a return value.")} / / the special case must be called with parentheses def xm (name:String= "Zhang San"): Unit = { Println (name)} xm () xm ("Li Si")}

3. Conditional expression

Method 1: val x = 100 val a = if (x > 0) {true} else {false} println (a) method 2: val x = 100 val a = if (x > 0) true else false println (a)

4. Cycle mode

/ / left closed and right closed 1 to 10 = 1.to (10) scala.conllection.immutable.Rang.Inclusive = Rang (1 until 2, 3 4 scala.conllection.immutable.Rang.Inclusive = Rang 6 7, 8, 9) / / left close and right open (source code call is also a Rang method) 1 until 10 = 1.until (10) scala.conllection.immutable.Rang.Inclusive = Rang (1 until 10) / left closed and right opened Range (1) scala.conllection.immutable.Rang.Inclusive = Rang / left close and right open (1) The last bit indicates the step size or interval and can not be 0Range (1meme 10jin3) scala.conllection.immutable.Rang.Inclusive = Rang (1meme 4m 7) / / IDEA usage for (I)

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